Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/111481
Title: Giant Suppression of the Drude Conductivity Due to Quantum Interference in the Disordered Two-dimensional System GaAs Inx Ga1-x As GaAs
Authors: Minkov, G. M.
Germanenko, A. V.
Rut, O. E.
Sherstobitov, A. A.
Zvonkov, B. N.
Issue Date: 2007
Publisher: American Physical Society (APS)
Citation: Giant Suppression of the Drude Conductivity Due to Quantum Interference in the Disordered Two-dimensional System GaAs Inx Ga1-x As GaAs / G. M. Minkov, A. V. Germanenko, O. E. Rut et al. // Physical Review B - Condensed Matter and Materials Physics. — 2007. — Vol. 75. — Iss. 23. — 235316.
Abstract: Temperature and magnetic-field dependences of the conductivity in heavily doped, strongly disordered two-dimensional quantum well structures GaAs Inx Ga1-x As GaAs are investigated within wide conductivity and temperature ranges. The role of the interference in electron transport is studied in the regimes where the phase breaking length L crosses over the localization length ξ∼l exp (π kF l 2) with decreasing temperature, where kF and l are the Fermi quasimomentum and mean free path, respectively. It is shown that all the experimental data can be understood within a simple model of the conductivity over delocalized states. This model differs from the conventional model of weak localization developed for kF l 1 and L ξ in one respect: the value of the quantum interference contribution to the conductivity is restricted not only by the phase breaking length L but also by the localization length ξ. In this approach, it is the quantity (τ*) -1 = τ -1 + τξ -1, rather than τ -1 [where τ T-1 is the dephasing time and τξ ∼τ exp (π kF l)], that governs temperature and magnetic-field dependences of the conductivity over the wide range of temperature and disorder strength down to the conductivity of order 10-2 e2 h. © 2007 The American Physical Society.
URI: http://hdl.handle.net/10995/111481
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 34347373078
ISSN: 1098-0121
metadata.dc.description.sponsorship: We are grateful to Igor Gornyi for very useful discussions. This work was supported in part by the RFBR (Grant Nos. 04-02-16626, 05-02-16413, and 06-02-16292), and by a grant from the President of Russian Federation for Young Scientists (MK-1778.2205.2).
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